Study on the Determination of COD_(Cr) in Wastewater with High Chlorine

By COD_(Cr) as organic pollutants indexes,chlorine ion in aqueous-solution sample is the important interfering factor that can affect the accuracy of the determinative result.Based on the chemical experimentation the feasibility of eliminating the interference of chlorine ion was discussed by absolute oxidation,the COD_(Cr) responding to the chlorine ion in a series of samples containing different K_2Cr_2O_7 concentrations,and made the standard curve of absolutely oxidation,and deliberating COD_(Cr) in actual samples containing varied chlorine ion concentrations.Consequence has shown that absolute oxidation is fit in determining COD_(Cr) in the organic pollutant high-chlorine water.